Experimental research on pyrolysis characteristics of small particle size low rank coal

Based on the thermogravimetry analysis of typical small particle size long flame coal,effect of pyrolysis temperature on product yield and quality were researched using 1kg external- heated equipment. The results showed that semicoke yield decreased and coal gas yield increased as the final pyrolysis temperature rised from 500 ℃ to 750 ℃. The proportion of H2 continuously increased with the highest of 44. 64%,the change of CH4 was opposite with the value of 28. 83% to 38. 55%. The coal tar yield rose first,then fell,it reached the maximum at 700 ℃. Particle pulverization happened during pyrolosis,and reinforced obviously when the temperature was higher than 650℃. The suitable pyrolysis temperature ranged from 600 ℃ to 700 ℃ for small size Shenmu coal.